I'm buying a new Z3 and want the Recaro seats. They'restandard on the sports package, but this also gives mestiffer suspension. I'm concerned it will be too stifffor these mountain roads I drive on (bad surface usually).If I bought aftermarket seats, would it affect the warranty?

Would the 17" vs. 16" wheels make much difference? I wasthinking, maybe the sports package w/ 16" would work.